Manhole door dismounting and mounting device

Abstract

The utility model belongs to the technical field of industrial equipment auxiliary devices, and discloses a manhole door dismounting and mounting device. Comprising a supporting frame, the supporting frame comprises a supporting piece, the supporting piece comprises a supporting face and a fixing part, the fixing part is arranged on the edge of the supporting face, and a connecting hole is formed in the fixing part; the fastening piece is arranged in the connecting hole in a penetrating manner; the lifting mechanism comprises a jacking assembly and a jacking platform, and the jacking assembly is used for driving the jacking platform to ascend and descend; the first adjusting part comprises a first connecting section and a second connecting section, the first connecting section is in threaded connection with the adjusting hole, and the second connecting section is rotationally connected with the supporting frame around a second axis. The utility model solves the problems of high risk and difficulty in centering when the manhole door is disassembled and assembled in a traditional way, shortens the maintenance time, reduces the radiation dose accepted by personnel, and ensures the efficient promotion of the main line work.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial equipment auxiliary device technical field especially relates to a manhole door dismounting device. BACKGROUND

[0002] In the field of nuclear power, the maintenance of the steam generator is crucial. At present, the dismounting of the manhole door on the side of the steam generator adopts the mode of cooperation of the winch and the chain hoist, but this traditional method has many drawbacks. In the centering aspect, due to the lack of precise positioning and control mechanism, it is difficult to realize accurate alignment and centering operation in the process of manhole door installation. This not only increases the operation difficulty, but also easily leads to installation deviation, affecting the subsequent use of the equipment.

[0003] The steel wire of the winch has serious safety hazards in the working process, and the steel wire is easy to be cut by the friction with the edge of the manhole. On the one hand, the manhole structure may be damaged, reducing the sealing performance and safety of the equipment; on the other hand, once the steel wire is broken, the heavy manhole door may fall instantly, causing great harm to the surrounding personnel and equipment. Moreover, this traditional mode is complicated to operate, and a lot of time is needed to adjust and try at each step. From the preparation to the completion of dismounting, the whole process is time-consuming and long. In some maintenance scenes with high time requirements, the work efficiency is seriously affected. At the same time, the operators are exposed to the working environment for a long time, especially in the nuclear power related scenes, which will cause unnecessary dose irradiation and threaten the health of the operators. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a manhole door dismounting device, aiming at solving the problems of high risk, long time, difficult centering and large dose irradiation of operators when using the traditional mode to dismount the manhole door.

[0005] In order to achieve this purpose, the utility model adopts the following technical scheme:

[0006] A manhole door dismounting device comprises:

[0007] A support frame comprises a support part, the support part comprises a support surface and a fixed part, the support surface is arranged inclinedly relative to the horizontal plane, the support surface is used for supporting the manhole door, the fixed part is arranged at the edge of the support surface, and a connecting hole is formed in the fixed part;

[0008] A fastener is arranged in the connecting hole, and the fastener is used for connecting with the manhole door;

[0009] A lifting mechanism comprises a jacking assembly and a jacking platform, the jacking assembly is used for driving the jacking platform to lift, one end of the jacking platform is rotatably connected with the support frame around a first axis, and the other end of the jacking platform is provided with an adjusting hole;

[0010] The first adjusting member comprises a first connecting segment and a second connecting segment, the first connecting segment is threadedly connected with the adjusting hole, the second connecting segment is rotationally connected with the support frame around a second axis, and the first connecting segment is rotationally connected with the second connecting segment around a third axis.

[0011] The first axis is parallel to the second axis, and the third axis is perpendicular to the first axis and the second axis.

[0012] Preferably, the support frame further comprises a first connecting member, a second connecting member, and a reinforcing member, the support member, the first connecting member, and the second connecting member are fixedly connected in sequence, and the reinforcing member is arranged inside the support frame, one end of the reinforcing member is fixedly connected with the support member, and the other end is fixedly connected with the first connecting member.

[0013] Preferably, the fixing part is arranged at the top end or the bottom end of the support surface, the axis direction of the fastener is parallel to the support surface, at least two second adjusting members are arranged on the support surface and located on both sides of the axis direction of the fastener, and the second adjusting members are threadedly connected with the support surface.

[0014] Preferably, the support surface comprises a first support surface and a second support surface, the first support surface and the second support surface are arranged in a cross manner, the fixing part is arranged at the top end or the bottom end of the first support surface, and at least two second adjusting members are arranged on the second support surface and located on both sides of the first support surface.

[0015] Preferably, the lifting mechanism further comprises a guide cylinder and a guide rod, one end of the guide rod is fixedly connected with the jacking platform, and the other end is slidably inserted into the guide cylinder.

[0016] Preferably, the manhole door dismounting device further comprises a base and a ground slide rail, the base is used for supporting the lifting mechanism, and the base is slidingly connected with the ground slide rail.

[0017] Preferably, both ends of the base are provided with traction parts, and the traction parts are used for bearing the force causing the base to relatively slide with the ground slide rail.

[0018] Preferably, the traction part is annular, handle-shaped, or strip-shaped.

[0019] Preferably, the jacking assembly comprises a driving member, a worm, a worm wheel, a lead screw, and a support cylinder, the output end of the driving member is transmissionally connected with the input end of the worm, the worm is engaged with the worm wheel, the center of the worm wheel is provided with an internal thread, the internal thread of the worm wheel is engaged with the lead screw, the support cylinder is provided with an internal thread, the internal thread of the support cylinder is engaged with the lead screw, and one end of the lead screw is rotationally connected with the jacking platform.

[0020] Preferably, the driving member is a hand wheel, a motor, or a hydraulic pump.

[0021] Advantages:

[0022] The manhole door dismounting device provided by the utility model has the advantages that when the manhole door is dismounted, the jacking assembly and the first adjusting piece are first adjusted, the supporting piece is attached to the manhole door, and the manhole door is fixed by the fastener, at this time, the bolt on the manhole door can be dismounted, and after the bolt is dismounted, the manhole door is fixed on the supporting piece; when the manhole door is mounted, the jacking piece and the first adjusting piece are adjusted, the manhole door is aligned with the manhole seat, the manhole door is fastened by the bolt, after the mounting is completed, the fastener is separated from the manhole door. The utility model solves the problems of high risk, long time and difficult centering when the manhole door is dismounted and mounted by using the traditional mode, greatly shortens the maintenance time, reduces the radiation dose accepted by the personnel, and guarantees the efficient promotion of the main line work. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the manhole door dismounting device of the utility model isometric view;

[0024] Figure 2 is the manhole door dismounting device support frame of the utility model isometric view;

[0025] Figure 3 is the manhole door dismounting device lifting assembly of the utility model isometric view;

[0026] Figure 4 is the first adjusting piece of the manhole door dismounting device of the utility model schematic view.

[0027] In the drawing:

[0028] 1, manhole door; 2, manhole seat; 3, support frame; 4, fastener; 5, lifting mechanism; 6, first adjusting piece; 7, base; 8, ground slide rail; 9, grating plate;

[0029] 31, supporting piece; 311, supporting surface; 312, fixed part; 3121, connecting hole; 33, first connecting piece; 34, second connecting piece; 35, reinforcing piece; 36, second adjusting piece;

[0030] 51, jacking assembly; 52, jacking platform; 53, adjusting hole; 54, guide cylinder; 55, guide rod;

[0031] 61 head; 62 first connecting section; 63 second connecting section; 631 pin hole; 71 traction part. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in connection with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0036] As Figures 1-4As shown, the manhole door dismounting device provided by the embodiment comprises a support frame 3, a fastener 4, a lifting mechanism 5 and a first adjusting member 6. The support frame 3 comprises a support piece 31, the support piece 31 comprises a support surface 311 and a fixing portion 312, the support surface 311 is used for supporting the manhole door 1 dismounted from the manhole seat 2, the shape and size of the support surface 311 are designed according to the size of the manhole door 1, so that the support surface 311 can be closely fitted with the manhole door 1, and the manhole door 1 can be stably placed during the dismounting process; the fixing portion 312 can be arranged at the edge position of the support surface 311, a connecting hole 3121 is formed in the fixing portion 312, the fixing portion 312 is used in cooperation with the fastener 4, the fastener 4 is arranged in the connecting hole 3121 and connected with the lifting ring mounting screw hole on the manhole door 1, so that the manhole door 1 is fixed on the support piece 31, and the cooperation of the fixing portion 312 and the fastener 4 ensures the reliability of the connection, compared with the similar magnetic connection mode, the cooperation of the fixing portion 312 and the fastener 4 can better ensure that the manhole door 1 will not be loose or fall off during the dismounting process, and the safety of the operation is ensured; the lifting mechanism 5 comprises a jacking assembly 51 and a jacking platform 52, the lifting mechanism 5 is used for adjusting the height of the support frame 3, so as to adapt to the height of the manhole seat 2 to be dismounted or installed, the jacking assembly 51 is used for driving the jacking platform 52 to lift, one end of the jacking platform 52 is rotationally connected with the support frame 3 about a first axis through a pin shaft or the like, the other end of the jacking platform 52 is provided with an adjusting hole 53, which is used for cooperation with the first adjusting member 6, the first adjusting member 6 comprises a first connecting section 62 and a second connecting section 63, and the first connecting section 62 and the second connecting section 63 are rotationally connected about a third axis, the first connecting section 62 is threadedly connected with the adjusting hole 53 of the jacking platform 52, and the second connecting section 63 is rotationally connected with the support frame 3 about a second axis through a pin shaft or the like, by rotating the first adjusting member 6, one end of the support frame 3 can be jacked up or dropped, so as to change the inclination angle of the support frame 3 relative to the jacking platform 52, so as to change the parallelism of the support piece 31 relative to the manhole door 1 or the parallelism of the manhole door 1 fixed on the support piece 31 relative to the manhole seat 2, so that the dismounting or installation process of the manhole door 1 is more convenient and smooth; wherein the first axis is parallel to the second axis, and the third axis is perpendicular to the first axis and the second axis.

[0037] The first adjusting member 6 further comprises a head 61 and a pin hole 631, the first connecting section can be screwed by the head 61, and the second connecting section 63 is rotationally connected with the support frame 3 through the pin hole 631, and the parallelism of the support frame 3 relative to the manhole door 1 or the manhole seat 2 can be finely adjusted by forward rotation and reverse rotation of the first adjusting member 6.

[0038] Preferably, the support frame 3 further comprises a first connecting piece 33, a second connecting piece 34 and a reinforcing piece 35, the support piece 31, the first connecting piece 33 and the second connecting piece 34 are sequentially fixed and connected, forming a stable triangular frame structure, the triangular structure has good stability, can withstand various forces generated during the disassembly and assembly of the manhole door, prevents the support frame from deforming or being damaged, and the triangular frame structure can save materials while ensuring the support strength, reduces the weight of the entire support frame 3, and is convenient for personnel operation. In this embodiment, the support piece 31, the first connecting piece 33 and the second connecting piece 34 are sequentially fixed and connected to form a right-angled triangular support frame 3, which is more stable and more beautiful; the reinforcing piece 35 is arranged in the interior of the support frame 3, one end of the reinforcing piece 35 is fixedly connected with the support piece 31, and the other end is fixedly connected with the first connecting piece 33. The reinforcing piece 35 improves the bearing capacity of the support frame 3, and ensures that the support frame 3 can safely and reliably support the manhole door 1 during high-load disassembly and assembly operations.

[0039] Preferably, the fixing part 312 is arranged at the top end or the bottom end of the support surface 311, the axis direction of the fastener 4 is parallel to the support surface 311, and at least two second adjusting pieces 36 are arranged on the support surface 311 of the support piece 31 and located on both sides of the axis direction of the fastener 4. The second adjusting piece 36 is threadedly connected with the support surface 311, and by adjusting the height of each second adjusting piece 36 from the support surface 311, the parallelism between the manhole door 1 and the manhole seat 2 can be finely adjusted. In this embodiment, the fixing part 312 is arranged at the top end of the support surface 311. In order to provide sufficient space for the arrangement of the second adjusting piece 36, the support surface 311 needs to have a certain width, so that the second adjusting piece 36 can play a role in adjusting the parallelism between the manhole door 1 and the manhole seat 2. This fine adjustment function is crucial for the accurate installation of the manhole door 1, and can ensure that the manhole door 1 is tightly matched with the surrounding structure after installation, thereby ensuring the sealing performance of the steam generator.

[0040] Preferably, in the present embodiment, the support surface 311 adopts a rectangular plate structure, which can play the role of supporting the manhole door 1, and is simple in structure and easy to manufacture. The support surface 311 comprises a first support surface and a second support surface, the first support surface and the second support surface are arranged in a cross manner, the fixing part 312 is arranged at the top end and the bottom end of the first support surface, and at least two second adjusting members 36 are arranged on the second support surface and located on both sides of the first support surface. The second adjusting member 36 is threadedly connected with the second support surface, and the second adjusting member 36 abuts against the manhole door 1 to realize fine adjustment of the parallelism of the manhole door 1 and the manhole seat 2. Compared with directly arranging the second adjusting member 36 on the same support surface 311, arranging the first support surface and the second support surface and arranging the second adjusting member 36 on the second support surface provides space for the arrangement of the second adjusting member 36, so that the second adjusting member 36 can fine adjust the parallelism of the manhole door 1 and the manhole seat 2. At the same time, the first support surface can realize the role of supporting the manhole door 1, the width of the first support surface is reduced, the processing material is saved, and in addition, more rotation space is provided for the adjustment of the manhole door 1, which is conducive to the adjustment of the parallelism of the manhole door 1 and the manhole seat 2.

[0041] Preferably, the lifting mechanism 5 further comprises a guide cylinder 54 and a guide rod 55, one end of the guide rod 55 is fixedly connected with the jacking platform 52, and the other end is nested in the guide cylinder 54. The cooperation of the guide cylinder 54 and the guide rod 55 provides stable guiding for the lifting of the jacking platform 52, prevents the jacking platform 52 from deviating or shaking during lifting, and ensures that the manhole door 1 can move vertically stably.

[0042] Preferably, the manhole door dismounting device provided in the present embodiment further comprises a base 7 and a ground slide rail 8. The base 7 is used for supporting the lifting mechanism 5 and providing a stable base platform for the whole lifting operation. The base 7 is slidingly connected with the ground slide rail 8. Through this sliding connection mode, the whole manhole door dismounting device can move along the extension direction of the ground slide rail 8 on the ground, which facilitates the movement of the manhole door 1 and provides sufficient space for the maintenance of the steam generator.

[0043] Preferably, the two ends of the base 7 are provided with traction parts 71, which can be in various forms such as ring, handle or strip. By applying force to the traction part, the base can slide relative to the ground slide rail. The operator can easily push or pull the base 7, realize the movement of the manhole door dismounting device along the extension direction of the ground slide rail 8, and improve the flexibility and operability of the tool. In the present embodiment, the traction part 71 adopts a ring structure, and the operator can use an iron hook to pull it.

[0044] The ground slide rail 8 is also provided with fixing screw holes, which can fix the ground slide rail 8 on the operation plane to improve the stability of the whole manhole door dismounting device, prevent it from falling during operation, and ensure the safety of operation.

[0045] Preferably, the jacking assembly 51 comprises a driving member, a worm, a worm wheel, a lead screw and a supporting cylinder, the worm wheel is provided with an internal thread in the center, the output end of the driving member is in transmission connection with the input end of the worm, the worm is in meshing connection with the worm wheel, the internal thread of the worm wheel is in meshing connection with the external thread of the lead screw, the supporting cylinder is provided with an internal thread, the internal thread of the supporting cylinder is in meshing connection with the external thread of the lead screw, one end of the lead screw is in rotational connection with the jacking platform 52, when the driving member outputs power, the worm is driven to rotate, the worm transmits power to the worm wheel, the worm wheel rotates and drives the lead screw to ascend or descend, so that the vertical lifting movement of the jacking platform is realized; the driving member can be in various forms such as a hand wheel, a motor or a hydraulic pump, and is selected according to actual use requirements and site conditions, which is not limited herein, and in this embodiment, the power output end is a hand wheel.

[0046] As shown in Figure 1 The ground slide rail 8 is fixedly connected to the grid plate 9, since the invention background of the utility model is about the dismounting and mounting of the side manhole door of the steam generator in the nuclear power plant, most of the operation platforms in the nuclear power plant are in the form of the grid plate 9, the manhole door dismounting and mounting device is fixed to the grid plate 9 beside the steam generator through the ground slide rail 8, and can be directly used when needed, without the need of on-site carrying and mounting; however, the manhole door dismounting and mounting device provided in this embodiment is not limited to this scene in the nuclear power plant, and is also applicable to other fields, and the grid plate 9 is not necessarily required, and needs to be selected or replaced according to different fields and scenes.

[0047] The operation steps of the manhole door dismounting and mounting device provided in this embodiment are as follows:

[0048] Dismounting operation:

[0049] For the first use of the manhole door dismounting and mounting device, the ground slide rail 8 at the bottom of the manhole door dismounting and mounting device is fixed to the appropriate position of the grid plate 9 near the side manhole door of the steam generator through the fixed bolt; the whole manhole door dismounting and mounting device is moved to the lower side of the side manhole door of the steam generator through the traction part 71, so that the position of the supporting frame 3 corresponds to the manhole door; then, the jacking assembly 51 is adjusted, the height of the supporting frame 3 is adjusted, the manhole door 1 can be accurately placed on the supporting part 31, and the manhole door 1 is firmly connected with the supporting frame 3 through the fastener 4 and the connection of the lifting ring mounting screw hole on the manhole door 1; at this time, the manhole door 1 is dismounted from the manhole seat 2, after the dismounting is completed, the whole manhole door dismounting and mounting device is pulled away from the steam generator through the traction part 71, the manhole door 1 is transferred from the manhole seat 2, a working space in front of the manhole is left, and personnel can conveniently maintain the steam generator.

[0050] Mounting operation:

[0051] When the personnel complete the maintenance work of the steam generator, the manhole door 1 is installed. First, the manhole door dismounting device fixed with the manhole door 1 is moved to the lower side of the manhole seat 2 by using the traction part 71, the jacking assembly 51 is started, the height of the jacking platform 52 is adjusted, the manhole door 1 is adjusted to the height close to the manhole seat 2, then the angle of the supporting frame 3 is finely adjusted by using the first adjusting part 6, the rotation of the supporting frame 3 at a certain angle is realized, the angle of the manhole door 1 fixed on the supporting part 31 is matched with the angle and position of the manhole seat 2, the parallelism is ensured to meet the installation requirements, then the manhole door 1 is rotated around the fastener 4 by using the second adjusting part 36, so that the parallelism of the manhole door 1 to the manhole seat 2 is adjusted again, after the fine adjustment is completed, the jacking assembly 51 is continuously started, the manhole door 1 is accurately assembled with the manhole seat 2, after the assembly is completed, the fastener 4 is loosened, the supporting frame 3 is separated from the manhole door 1, finally, the whole manhole door dismounting device is moved away by using the traction part 71, and the installation operation of the manhole door is completed.

[0052] In summary, the manhole door dismounting device can effectively solve many problems in the dismounting process of the manhole door, improve the efficiency, precision and safety of the dismounting work, shorten the maintenance time, reduce the radiation dose accepted by the personnel, ensure the efficient promotion of the main line work, and has wide application prospect and practical value.

[0053] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the implementation mode of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, all the implementation modes need not to be exhausted. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A manhole door disassembly and assembly device, characterized in that: include: A support frame (3) includes a support member (31), the support member (31) including a support surface (311) and a fixing portion (312), the support surface (311) being arranged obliquely relative to a horizontal plane, the support surface (311) being used to support the manhole door (1), the fixing portion (312) being arranged at an edge of the support surface (311), and a connecting hole (3121) being provided on the fixing portion (312); A fastener (4), the fastener (4) being passed through the connecting hole (3121), and the fastener (4) being used to connect with the manhole door (1); A lifting mechanism (5) comprises a lifting assembly (51) and a lifting platform (52), wherein the lifting assembly (51) is used to drive the lifting platform (52) to move up and down, one end of the lifting platform (52) is connected to the support frame (3) for rotation around a first axis, and the other end of the lifting platform (52) is provided with an adjustment hole (53); A first adjusting member (6) comprises a first connecting section (62) and a second connecting section (63), wherein the first connecting section (62) is threadedly connected to the adjusting hole (53), the second connecting section (63) is rotatably connected to the support frame (3) around a second axis, and the first connecting section (62) and the second connecting section (63) are rotatably connected around a third axis; The first axis is parallel to the second axis, and the third axis is perpendicular to the first axis and the second axis.

2. The manhole door disassembly and assembly device according to claim 1, characterized in that: The support frame (3) further comprises a first connecting member (33), a second connecting member (34) and a reinforcing member (35); the support member (31), the first connecting member (33) and the second connecting member (34) are fixedly connected end to end in sequence; the reinforcing member (35) is arranged inside the support frame (3); one end of the reinforcing member (35) is fixedly connected to the support member (31), and the other end is fixedly connected to the first connecting member (33).

3. The manhole door disassembly and assembly device according to claim 1, characterized in that: The fixing portion (312) is arranged at the top or bottom end of the supporting surface (311), the axial direction of the fastener (4) is parallel to the supporting surface (311), at least two second adjusting members (36) are arranged on the supporting surface (311) and are located on both sides of the axial direction of the fastener (4), and the second adjusting members (36) are threadedly connected to the supporting surface (311).

4. The manhole door disassembly and assembly device according to claim 3, characterized in that: The supporting surface (311) comprises a first supporting surface and a second supporting surface, the first supporting surface and the second supporting surface are arranged crosswise, the fixing portion (312) is arranged at the top end or the bottom end of the first supporting surface, and at least two second adjusting members (36) are arranged on the second supporting surface and located on both sides of the first supporting surface.

5. The manhole door disassembly and assembly device according to claim 1, characterized in that: The lifting mechanism (5) further comprises a guide cylinder (54) and a guide rod (55), one end of the guide rod (55) is fixedly connected to the lifting platform (52), and the other end is slidably inserted into the guide cylinder (54).

6. The manhole door disassembly and assembly device according to any one of claims 1 to 5, characterized in that: The manhole door disassembly and assembly device further comprises a base (7) and a ground slide rail (8); the base (7) is used to support the lifting mechanism (5); and the base (7) is slidably connected to the ground slide rail (8).

7. The manhole door disassembly and assembly device according to claim 6, characterized in that: Both ends of the base (7) are provided with traction parts (71), and the traction parts (71) are used to withstand the force that causes the base (7) and the ground slide rail (8) to slide relative to each other.

8. The manhole door disassembly and assembly device according to claim 7, characterized in that: The traction portion (71) is in a ring shape, a handle shape or a strip shape.

9. The manhole door disassembly and assembly device according to any one of claims 1 to 5, characterized in that: The lifting assembly (51) includes a driving member, a worm, a worm wheel, a screw and a support tube, the output end of the driving member is transmission-connected to the input end of the worm, the worm is meshed with the worm wheel, the center of the worm wheel is provided with an internal thread, the internal thread of the worm wheel is meshed with the screw, the support tube is provided with an internal thread, the internal thread of the support tube is meshed with the screw, and one end of the screw is rotationally connected to the lifting platform (52).

10. The manhole door disassembly and assembly device according to claim 9, characterized in that: The driving member is a hand wheel, a motor or a hydraulic pump.

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